Telephone amplifier with inductive pickup. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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That was the title of G. Bortnovsky's article in "Radio", 1996, No. 10, p. 36, 37, which talked about the AF amplifier, connected with an inductive sensor to a telephone set and allowing you to listen to telephone conversations through a dynamic head.
Young radio amateur, fifth-grader Igor Kutsko from Krichev, Mogilev region. (Republic of Belarus), proposed to significantly reduce the number of parts of such a device by using a ready-made amplifier - a K174UN7 microcircuit (Fig. 1). The volume of the sound in the dynamic head BA1, when the signal amplifier is input from the inductive sensor L1 or from the X1 connector (connected, for example, to the output of the player), can be controlled by a variable resistor R1.
The amplifier is powered by a source composed of two 3336 batteries connected in series, six galvanic cells or a mains rectifier, such as an adapter. With the latter power supply option, the source must be placed as far as possible from the inductive sensor in order to eliminate the background of alternating current in the dynamic head.
You can mount the main parts of the amplifier on a printed circuit board (Fig. 2) made of one-sided foil fiberglass.
Author: I. Kutsko, Krichev, Mogilev region, Republic of Belarus
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